Andrew glouberman is one of the two main protagonists (alongside nick birch) of big mouth. Bernie had all the right in the world to be mad at andrew, but instead of her dumping him because she feels angry or betrayed, she dumps him because allison confessed to her. Bernie seems savvy enough, even at 13, to know better than tell him it's not her responsibility to fix him.

Understanding the Context

Maybe she's not experienced enough to give shape to that thought, but i definitely was.